American telegraphy and encyclopedia of the telegraph: systems, apparatus, operation. Embracing electrical testing; primary and storage batteries; dynamo machines; Morse, duplex, quadruplex, multiplex, submarine, automatic, and wireless telegraphy; burglar-alarm, fire-alarm, and police-alarm telegraphy; printing telegraphy; military and naval signaling; railway block systems; telegraph wire, cables, and conduits; etc.

by

Maver, William, jr